.boxs {
  width: 600px;
  margin: 50px auto;
  display: -webkit-box;
  display: -webkit-flex;
  display: -moz-box;
  display: -ms-flexbox;
  display: flex;
}
.prev, .box .items,.next {
  background-color: black;
  color: white;
  text-align: center;
}
.boxs .items {
  text-align: center;
  line-height: 30px;
  margin: 0 5px;
  width: 30px;
  height: 30px;
  color: white;
  background-color: black;
}
.boxs .tive {
  background-color: red;
}
.prevs{
  background-color: aquamarine;
}